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Hi Noelle,
If you are talking about leaving an organization with your personal account please see:
https://learn.microsoft.com/en-us/entra/external-id/leave-the-organization
If you are speaking about a business account I would recommend reaching out to Microsoft support by using the Get Help:
https://learn.microsoft.com/en-us/microsoft-365/admin/get-help-support?view=o365-worldwide
If this is helpful please accept answer.